Method of screen process printing



. Oct. 11,1'938. N. LoUFT METHOD oF scmiEN PRooEss PRINTING loriginal Filed Juiy 2o, 1935 .m 4. fa] .T um n0. .QC n, uw e. m m G .M mi

Patented oct. 11, 193s PATENT OFFICE METHOD F SCREEN PROCESS PRINTING Nathan Louft, Silver Spring, Md.

Original application July 20, 1935, Serial No. 736,270. Patent No. 2,052,933, dated September 1, 1936. Divided and this application June 26,

1936, Serial No. 87,574

e claims. (c1. 41-3s.5)

This is a division of application filed July 20,- 1935, Serial #736,270 which has issued as Patent No, 2,052,933, Sept. 1, 1936.

This invention relates to the art of sign mak- -ing and more particularly to a method of yscreen process printing.

'Ihe main object of the present invention is to provide a method of making stencils for producing signs of one or more colors uniformly, accurately, quickly and at a low cost.

Another object of the invention is to generally improve and simplify the present method of producing signs, to provide a means whereby a picture, design or lettering containing one or more colors may be delineated or reproduced on a semismooth or rough surface, such as paper, cardboard and the like, by forcing the color through j a stencil, portions of which are temporarily or permanently marked out as the successive colors are applied. I

With the above and other objects in view, which will appear as the description proceeds, the irlvention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that within the scope of what is claimed, changes in the precise embodiment of the invention shown can be made without departing from the spirit of the invention. v

The method of making signs according to this invention, in brief, `consists of drawing the sign on a sheet of cardboard or the like, temporarily pasting a transparent sheet of paper over said sheet of cardboard, cutting out in outline with a 35 sharp tool the portions of the transparent paper which overlay the sign and forming a stencil, transferring the stencilled out transparent paper to the underside of a screen and then using the screen to make the signs by placing the screen over the sign backing and forcing the paint through said screen, through the openings of the stencil onto said sign backing and forming the sign.

In this drawing is shown one form of stencil apparatus'illustrating the invention together with the method of using the device in the production of the signs but it'will be understood that this embodiment ofthe invention has been selected vfor the purpose of illustration only and that the stencil sheet may take various forms.

In the accompanying drawing:

Figure 1 is a view of the sign in outline drawn on a sheet of cardboard.

Figure 2 shows the sign covered with/a sheet of transparent paper.

Figure 3 shows the transparent paper stencilled out around the outline of the sign lettering.

Figure 4 shows the stencilled out transparent paper attached to the underside of a screen.

Figure 5 shows the finished sign. 5

Figure 6 is a similar View of Figure 5 but showing a two .color sign consisting of the letters NRA and the outside border of contrasting colors.

Figure 7 is a perspective View showing the method of applying the paint to the screen.

Figure 8 is a sectional View of the stencil paper.

Referring to the drawing in detail, the first step in the process consists of drawing the sign I in outline, which is shown here as comprising the letters NRA on a sheet of stiff backing 2 of any suitable material. The next step is to temporarily paste a sheet of transparent paper 3 over the backing 2. The said sheet is coated on the side 4 with. wax and on the opposite side 5 with a coat of glue and then with another coat of parafne. As noted in Figure 3 the side which is coated with wax is in contact withthe backing 2. The transparent sheet can easily be attached to the backing by goin'g over the sheet with a warm flat iron or the use of pressure.

The following step in the process is to cut out with a sharp instrument the letters NRA in outline from the transparent sheet and removing the cut out portions, care of course being .taken not to cut deeply in the backing. The transparent sheet will thus become a stencil. The purpose of covering the glued coating of the paper 3` with another coating of paraine is to prevent the paper from sticking to the fingers. The paraiiine acts as a sort of insulator and prevents the glue from adhering to the fingers when cutting the stencil.

The next step is to place the stiff backing with the stencilled sheet 3 attached underneath Va screen 6 and transferring the sheet from the backing to the said screen. 'I'his is done by wetting the screen and going over it with a relatively hot iiat iron. As stated above the upper side 5 of the sheet' is coated with glue and parf affine and it is this side which comes in contact 45 with the screen. Thel heat from the flat iron will melt the wax coating which holds the said sheet to the backing, and at the same time the glue and the paraii'ine on the paper face of the sheet will melt together. forming an adhesive compound and cause the sheet to adhere to the underside of the screen so that when the `screen is lifted from the backing the stencilled sheet will be transferred in its entirety to the screen and in the same relation it -was when attached to the backing. 'I'he screen ordinarily comprises a rectangular frame 'l over which is stretched a sheet of fine mesh fabric, preferably silk, as shown at 8.

The last step in the process consists of placing the screen with the stencilled sheet underneath over the sign backing 9 on which will appear the nished sign, pouring the paint l over the screen as shown in Figure 7 and with a squeegee Il forcing the paint through the openings I2 in the stencilled sheet 3 through the mesh of the screen onto the backing 9. It is obvious that where the stencilled sheet is solid the paint will not come in contact with the sign backing but only through the openings I2 of the stencilled sheet. The result is that the finished sign comprising the letters NRA will appear in solid color in outline exactly as the original letters NRA` appearing on the backing-2 shown in Figure 1.

If it is desired to make a two colored sign as for instance by adding a border I3 of another color a stencil of the border is made in the same way as the original sign and same process practiced.

It will thus be seen that I have provided a method of producing signs in large or small quantities of one or more colors uniformly, accurately, quickly and at a low cost. The screen can be used over and over again by simply soaking the screen in water and peeling off the old stencil and attaching a new one.

Having described my invention, I claim:

1. A method of reproducing designs, such as signs, pictures, etc., by placing a transparent film, coated on one side with wax and the other side with glue over the design that is to be reproduced, aflxing wax side of the film to the design and cutting away selected portions of the design through the film, then by placing a damp or moistened screen over the lm and the design and applying heat over said screen to cause glue side of said film to adhere to said screen and at the same time causing the 'fllmto release from\ said design, then by placing said 'screen over a suitable material on which the design is to be reproduced and forcing paint through said screen for reproduction.

2. In a method of reproducing signs or the like by placing a transparenter translucent paper, coated on one side with wax over the sign and the other side of the paper coated with glue, heating and smoothing out said paper with a warm iron on the sign and causing wax to hold the paper and the sign together, cutting selected portion of said sign through the paper, then placing a damp or moistened screen over said paper and said sign and heating and pressing with a hot iron, causing glue to adhere to the damp screen, and causing the wax to melt between said paper and said sign and causing said paper to release from the sign and forming a stencil, which is placed over the article on which reproduction is to be made and forcing paint through stencil.

3. In a method of makingsigns, covering a sign with a transparent paper coated on one side with wax and on the other side with a coat of glue and a coat of parailine so that the waxed side will come in contact with said sign, heating said transparent paper so that the waxed portion will adhere to said sign, cutting the outline of said sign in said transparent paper and making a stencil thereof, placing said stencil in contact with a damp screen with the parafllned surface in contact thereof, heating the screen and stencil so that the stencil will release itself from the sign and stick to the screen, placing the screen with the stencil attached thereto on a backing and painting over said screen so that the paint will pass through said screen, through the cutout portions of said stencil and onto said second mentioned backing. l 4. In a method of making signs, the steps which consist in covering a sign with a transparent paper coated on one side with glue and the other side -with wax, pressing said transparent paper so that it will adhere to said sign, cutting theoutline of said sign in said transparent paper and making a stencil thereof, placing said stencil in contactwith a screen, wetting the screen and stencil so that the stencilv will stick to the screen and heating the screen and stencil so it will release itself from the sign and placing the screen with the stencil attached thereto. on a backing and painting over said screen so that the paint will pass through said screen, through the cutout portions of said stencil and onto said backing.

5. In a. method of reproducing signs the steps which consist of covering a sign with a transparent paper coated on both sides with an adhesive, wax onv one side-glue on the other side, using pressure to adhere transparent paper to a sign, cutting away the outline of said sign in transparent paper and making a stencil thereof, placing said stencil in contact with a screen, moistening said screen which will cause stencil paper to adhere to screen, pressing with hot iron said screen and said stencil to release stencil paper from sign, placing the screen with the stencil attached thereto on a backing and painting over said screen so that the paint will pass through said screen. through the cut-out portions of said stancil and onto saidbacking. s

6. A method of reproducing signs, the steps which consist in laying out in outline the sign on a backing, covering the sign with a transparent paper, said paper coated on one side with glue and other side with wax, adhering wax side to said sign and said backing, cutting away the outline of said sign in said transparent paper making a stencil thereof, placing said stencil in contact with screen whichhas been moistened with water, pressing with hot iron and causing firmadhesion of stencil paper to screen, and at the same time liquefying wax holding stencil to backing and causing release thereby of said stencil to said backing, placing said screen and stencil over another backing and painting over said screen so that the paint will pass through said screen, through the cut-out portions of said stencil and onto said last mentioned backing.

NATHAN LOUFI. 

